Ramos was charged Sunday with first-degree premeditated murder and is now being held in a juvenile detention center.
The 15-year-old Florida boy allegedly confessed to strangling his mom over a bad grade.
The boy then went to school Friday morning and came home to report his mother as missing to police and their home ransacked by unknown intruders.
After the killing, authorities said, the boy called friends to help him make it look like someone had burglarized the home.
Officials with the Sheriff's Office said the 15-year-old called 911 Friday, claiming to have found his home burglarized, his mother nowhere to be found and her vehicle running.
A 15-year-old Florida boy is accused of killing his mother after an argument over a school grade and then burying her outside a church.
The sheriff said the attack took place after Cleavenger called her husband - the teen's stepfather - Thursday night to inform him about her son's D grade and an argument that took place after she learned of it, while he was away on a business trip in Washington state.
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However the details did not add up after Cleavenger's architect firm said she didn't show up to work that morning.
The boy faces murder charges, Sheriff Chitwood said.
After strangling her with a rope, according to police, the son used wheelbarrow to move his mother's body to her truck and then drove it to River City Church and buried it in a fire pit. He told the Daytona Beach News-Journal he agreed with the judge's decision that probable cause existed to detain his client on a murder charge.
But Chitwood said detectives suspected the story from the start and brought Ramos in for questioning.
After burying the body eight inches deep, Ramos returned home and went to school, but left early in order to establish his alibi. But rather than expressing guilt or remorse, Chitwood said he seemed proud. There, he buried the body beneath a fire pit.
The murder of Gail Cleavenger is as gruesome as it is chilling, with the local sheriff telling Fox 35 that the case is "one of the most disturbing and saddest I've seen in my career".